Fuse-plug



w. L CARLSON.

FUSE PLUG. APPLICATION FILED MAR. 8, I918.

Patented July 15, 1919.

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Application filed 35.2.1011 8, 1918.

- To all whom it may concern:

Be it known that I, Wnnonnn L. GARLSON, a citizen of the United States,residing at Jamestown, in the county of Chautauqua and State of NewYork, have invented eertein new and useful Improvements in Fuse- Plugs,of which the following, taken in con;

fuse is visibly inclosed so that a blow out is quickly discernible, theparts being so in terlocked upon one another that they are retained infirm contact hythe threaded me tallic sleeve which forms one of themetal terminals of the plug, and the invention consists in the novel"features and combina; tions hereinafter set forth and claimed.

in the drawings, Figure 1 is a top plan view ofthe closed plug showingthe fuse through the mica plate in the top; and Fig.

i 2 is a top plan view. of the two parts separated froni one anotherwith the mica plate retained in one of said parts while the fuse isretained in the other. Fig. 3 is a plan view crthe mica plate. Fig. is aside elevation of the fuse plug showing the upper end of the fuseconnection to the outer metallic sleeve and in dotted line theconnection to the terminal at the inner end of the plug. Figs. 5 and 6show sectional views of the two parts or": the porce a n ruse plugwithout the metallic hand, s parts being separated from one another,rig: 5 showing the nice. plate in the groove of one part and Fig. 6showing the eve in the opposite ls-shaped portion which ins the edge ofthe mica plate. F is plan View of the inner end of the inner terminal.the use and the inne from the porcelain. plug nor of attachinginner-terminal to the of the fuse. i 9 is an elevation of the threadedor spirally corrugated ring ter- 131 which the two porcelain partsdetached I e s i 1 oi the inse plug.

Specification Letters Patent.

said split stem.

showing the man- Patented July 15, 1919.

Serial No. 221,116.

Like charac ers of reference refer to cor responding pairs in theseveral views.

The numeral 10 desi nates one portion or member and the numeral 11 theother portion or member of the porcelain plug which are united at theL-shaped joint 12 by the metallic spirally corrugated 'or threaded hand13 which forms one of the terminals of the plug, the outer surfaces ofthe parts 10 and 11 being threaded at 14 to fit the hand 13.

The parts 10 and ii are preferably made of porcelain and each hasportions of the chamber or opening therein, that is, when the two parts10 and 11 are united by the band 13 they form, as it were, a smallporcelain receptacle having the groove 16 a spaced distance from the toparound the inner walls of the chamber to receive therein the mica plate17 so that the interior of the chamber 15 said mica plate 1 1'. The part10 preferably has the inner end porten 1S thereon. This is attained bythe angular shaped but which provides he extension 19 to one sideheneath and the inner end of the part 11 so that the edge or" theextension 19 is engaged by the hand 13 when said hand is turned onto thecorrespondingly threaded outer surface is of the parts 10 and 11. i

The inner terminal consists of a metallic plug 20 in the shape of acapped pin with a split stem into which one end of the fuse -21 fits sothat it may he quickly and easily inserted therein. The stem of thepinor plug 20 his within the hole 24 in the inner end of t is portion 10so as to press the parts of the stem of the pin 20 together upon the endoi the fuses so as to hold said fuse therein, or it may he solderedwithin The opposite endof the fuse 21 is enlarged so as to extend outthrough the hole 23 in the side of the porcelain part 10 so as toreceive the upper edge of the metallic hand 13 thercagainst. Theflattened end may be turned either upward or downward and so engaged asto he firmly held within the hole 23 and formed so as to he brought intofirm contact with the nietallic hand 13, or soldered thereto.

It is apparent that the holes 23 and 24 are both contained in the partlOsothat the fuse may be attached firmly therein While the two arts 10and 11 are separated, after which said parts may be united Without disisalways visible through through the holes 23 turbance to the attachedfuse 21. Thus in assembling the fuse plug, the fuse is first attached tothe pin terminal 20 and passed up and 24, the stem of the pin 20 fittingfirmly within the hole 24 The end 22 of the fuse 21 is securely attachedin the hole 23, the part 11 is placed against. the part 10 with the micalate 17 in the groove 16 extending within t e two parts and the metallicband,v 13 is then screwed onto the periphery of the two parts 10 and 11and firmly against the end 22 thereby holding the two parts of the plugfirmly in contacting relation and locking the mica plate 17 wit in thegroove 16 of the two parts and bringing the band terminal 13 intocontact with the end 22 of the fuse 21. It is apparent that the fuse 21is always visible through the firmlv held mica plate 17.

I claim as new 1. A fuse plug comprising two portions having an l.-shaped joint therebetween allowing sidewise separation, said portionsshaped to form a chamber therewithin having a groove around its walls aspaced distance'from the outer end thereof, a mica plate fitting withinsaid groove to form a 'end hole, a metallic pin threaded exterior,

transparent closure for said chamber, the peripheries of said portionsthreaded, a threaded band to lit over said portions and hold them 111contacting relation, one of said portions having holes therein onethrough the inner end and the other through the side thereof a spaceddistance from said inner said hole in the inner end, and a fuse con:necting said metallic pin terminal to said threaded hand through saidchamber and hole in the side.

2. A fuse plug comprising an L-shaped semi-circular portion and a secondsemi-circular portion fitting into said L-shaped portion to formportions having a chamber therein and a said L-shaped portion having ahole in the inner end and a second hole through the side thereof, ametallic terminal in said inner end hole having a split stem compressedby the walls of said inner end. hole, a metallic band terminal threadedto fit said threaded exterior of said portions to said second hole, afuse having one end engaged in the split stem of said metallic terminaland the other end extending out through said second hole to be engagedby said band terminal and thereby connect said terminals, said portionshaving a groove around the inner walls of said chamber above said secondhole, and a'mica terminal received in a round plug therewith, said"plate fitting in said groove to render visible the vinterior of saidchamber while closing the same.

3. A fuse plug composed of two complementary sections each having ahollow interior so as to conjointly provide a chamber, one of. thesections having an extension forming an end for the chamber and theother section having one end seating on said extension, fuse in thechamber connected at one end to the extension and at its opposite endtothe side of said first named section, a transparent plate formin aclosure for the other end of the chamber, and a sleeve threaded oversaid sections.

4. A fuse plug composed of two complementary sections each having ahollow interior so as to conjointly provide a chamber, a use in thechamber connected at its ends to one of the sections, a transparentplate secured to the sections to form a closure for the outer end of thechamber, and a sleeve threaded over the sections.

5. A fuse nlug divided along a line extending axially of the plug toform two sections separable by relative lateral movement, each sectionhaving a hollow interior so as to conjointly provide a chamber, a fusein the chamber, a transparent plate forming a closure for the outer endof the chamber, a sleeve threaded over the sections to hold sameassembled, and means to secure the plate to the sections so as to allowthe latter to be separated upon removal of the sleeve.

6. A fuse plug divided along a line extending axially of the plug toform two sections separable by relative lateral a threaded sleeveencircling the members for holding same against movement, each of thesections having a groove adjacent the top thereof, and a transparent plahaving its opposite portions fitting, in the respective grooves of thesections. I

7. A fuse mentary hollow sections each exteriorly threaded and havingfaces which meet in a line extending longitudinally ofthe plug toconjointl form a chamber and to allow sepmovement,

lug composed of two complearation tr ereof by relative lateral movement,

a fuse in the chamber, means to close the chamber ends, and a sleevethreaded over said sections to normally hold same against lateralmovement.

In testimony whereof I have aiiixed my signature in the v resence of twowitnesses. W 'NDELL L. CARLSON. Witnesses:

MARIAN BROOKE, H. Eosoiv Rooms.

